Atlantic States Marine Fisheries Commission

Transcription

1 Atlantic States Marine Fisheries Commission DRAFT ADDENDUM I TO THE OMNIBUS AMENDMENT TO THE INTERSTATE FISHERY MANAGEMENT PLANS FOR SPANISH MACKEREL, SPOT, AND SPOTTED SEATROUT FOR PUBLIC COMMENT Spanish Mackerel Commercial Management Measures for 2013 and 2014 ASMFC Vision Statement: Healthy, self-sustaining populations for all Atlantic coast fish species or successful restoration well in progress by the year 2015 June 2013

2 Public Comment Process and Proposed Timeline At the May 2013 Commission meeting, the Atlantic States Marine Fisheries Commission s South Atlantic State-Federal Fisheries Management Board approved a motion to initiate the development of an addendum to the Omnibus Amendment to the Interstate Fishery Management Plans for Spanish Mackerel, Spot, and Spotted Seatrout (Omnibus Amendment). The Draft Addendum proposes alternative measures that could be considered under the adaptive management/framework procedures of the Omnibus Amendment. This Draft Addendum presents background on the Atlantic States Marine Fisheries Commission s (ASMFC) management of Spanish mackerel; the addendum process and timeline; a statement of the problem; and proposed management options for public consideration and comment. The public is encouraged to submit comments regarding this document at any time during the public comment period. The final date comments will be accepted is July 19, 2013 at 5:00 p.m (EST). Comments may be submitted by mail, , or fax. If you have any questions or would like to submit comment, please use the contact information below. Mail: Kirby Rootes-Murdy Atlantic States Marine Fisheries Commission krootes-murdy@asmfc.org 1050 N. Highland St., Suite 200 A-N Phone: (703) Arlington, VA Fax: (703) May 2013 Draft Addendum for Public Comment Developed June 2013 Board Reviews Draft and Makes Any Necessary Changes June- July 2013 August 2013 Public Comment Period Management Board Review, Selection of Management Measures and Final Approval Current step in the Addendum Development Process 1

3 1.0 Introduction Spanish mackerel are cooperatively managed by the states through the Commission in state waters (0-3 miles from shore), and by the South Atlantic Fishery Management Council and NOAA Fisheries in federal waters (3-200 miles from shore). The management unit for Spanish mackerel consists of all estuarine waters to the inshore boundary of the exclusive economic zone (EEZ) from New York through the east coast (Monroe/Dade county line) of Florida. The South Atlantic State-Federal Fisheries Management Board (Board) met on May 23, 2013 to discuss alternative measures that could be considered under the adaptive management/framework procedures of the Omnibus Amendment to the Interstate Fishery Management Plans for Spanish Mackerel, Spot, and Spotted Seatrout (Omnibus Amendment). The purpose of proposed alternative measures was to consider seasonal flexibility in setting the minimum size limit of Spanish mackerel for pound nets gear type in the commercial sector. This would allow for conversion of dead discards so as to minimize waste from this fishery. The Board initiated this draft addendum through the following action: Move to proceed with expedited process to develop an addendum to the Spanish Mackerel FMP to allow states to reduce minimum size to 11 ½ inches for the fishing year 2013 and 2014 (July through September) for the pound net fishery to eliminate waste of dead discards. 2.0 Overview 2.1 Statement of the Problem A portion of the Spanish mackerel entering estuarine pound nets during the summer months are just under the legal size limit of 12 inches fork length. When the nets are bunted and the fish bailed, the undersized Spanish mackerel are difficult to release alive and quickly die, unlike other species. An allowance for a minimum size limit of 11.5 inches fork length for pound nets during summer months would reduce these dead regulatory discards Background Spanish mackerel (Scombermorus maculates) are distributed throughout the western Atlantic and Gulf of Mexico (Collette and Russo 1979, 1984). The most recent assessment report continues to support the existence of two stocks, one in the eastern Atlantic and one in the eastern Gulf of Mexico (SEDAR 2012). The Miami-Dade/Monroe County, Florida boundary has been used as the management boundary for the two stocks, separating the South Atlantic Fishery Management Council and the Gulf of Mexico Fishery Management Council jurisdictions. Atlantic group Spanish mackerel generally range from the Florida Keys northward through New York and occasionally to southern New England. They migrate seasonally, overwintering off the east coast of Florida and migrating northward to the Carolinas and the mid-atlantic in the spring as waters warm (Berrien and Finan 1977). The spawning season for Spanish mackerel generally increases from north to south, due mainly to warmer water temperatures (SEDAR 2012). Since 1950, the majority (greater than 85% on average) of commercial landings has been attributed to the east coast of Florida, followed by North Carolina and Virginia. While these three states account for greater than 99% of commercial landings, the states of Maine, Massachusetts, New York, Rhode Island, 2

4 Connecticut, Delaware, Maryland, New Jersey, South Carolina and Georgia also have recorded commercial landings of Spanish mackerel Stock Status A benchmark assessment of the Atlantic group Spanish mackerel stock was conducted through the South East Data, Assessment, and Review (SEDAR) process in SEDAR 28 assessed both Gulf and Atlantic migratory groups of Spanish mackerel, and the results indicate that the Atlantic stock is neither overfished (SSB/MSST = 2.29) nor experiencing overfishing (F 2011 /F msy = 0.521) North Carolina Pound Net Commercial Fishery Description The majority of North Carolina s commercial Spanish mackerel fishery occurs in state waters, with less than five percent of harvest, on average, occurring in federal waters (Table 1). Landings from state waters are split between the ocean (53.09%) and Pamlico Sound (37.27%), with other estuarine water bodies accounting for less than five percent of remaining harvest (Table 1). Commercial harvest of Spanish mackerel in North Carolina is dominated by landings from gill nets, with an average of 92.12% of landings attributed to this gear (Table 2). Pound nets account for an average of 6.69% of Spanish mackerel landings with remaining gears each contributing less than 1% of total landings. Of the pound net landings, on average, over 99% of all harvest occurs in Pamlico Sound (Table 3). Pound net harvest generally occurs during the summer and fall months, with the highest average landings of Spanish mackerel occurring in June (Table 4). The second and third highest average landings occur during the months of July and August, respectively. In recent years, fishermen have noted the presence of increased numbers of Spanish mackerel that are ¼- inch to ½-inch short of the 12 inch fork length minimum size limit in pound nets during August and September. While the fish are alive in the pound, once the net is bunted and bailing commences, they die before being released. This may be due to a combination of temperature, stress and crowding. Most pound nets are constructed using 1 ½-inch to 1 5/8-inch inch mesh in the pound and 4-inch to 6-inch mesh for the leads. While individual fishermen have experimented with different wall or panel mesh sizes depending on the target species, there is no consistent use of cull panels. Those who have used cull panels have noted the difficulty and lack of success in being able to release the undersized fish quickly enough to prevent dead discards during this time of year. In order to further illustrate the impact of the existing minimum size limit on this gear during August and September, an analysis was conducted using fishery-dependent and fishery-independent sampling data (Appendix A). The results of the analysis indicate that approximately 200 pounds of Spanish mackerel between 11 ½ and 12 inches (i.e., undersized fish) were landed annually from pound nets during the months of August and September in North Carolina. These results illustrate the difficulty in culling the undersized Spanish mackerel from the catch at this time of the year, and the impact of the minimum size limit on dead discards. 3

5 3.0 Proposed Management Options Option 1: Status Quo Commercial Management Measures Maintain current commercial management measures of 12 fork length or 14 total length minimum size limit, with seasonally changing day and vessel trip limits and a decrease in commercial quotas if total annual catch limit is exceeded AND stock is overfished Option 2: Alternative size limit To alleviate the issue of dead discards from pound nets during the months of July through September, states may establish a seasonal exemption from the current minimum size limit of 12-inch fork length minimum size to 11 ½-inch fork length. This exemption would apply to only pound net fisheries during one or more of the summer months of July through September for the 2013 and 2014 fishing years only. A state must notify the Commission of the specific month or months it intends to use the minimum size limit exemption. The impacts of these measures would be reviewed by the Technical Committee and/or Plan Development Team as part of its annual fishery management plan review. If this addendum is approved, the Board may extend the use of the summer month minimum size limit exemption through Board action. 4.0 Compliance Adopted measures would be implemented immediately upon approval of the Draft Addendum. References Berrien P and D Finan Biological and fisheries data on Spanish mackerel, Scomberomorus maculatus (Mitchill). Highlands (NJ): NMFS Sandy Hook Laboratory. Technical Series Report No p. Collette, B. B., and J. L. Russo An introduction to the Spanish mackerels, genus Scomberomorus, p. 3-16, In: Nakamura and Bullis (eds.), Proceedings: Colloquium on the Spanish and king mackerel resources of the Gulf of Mexico. Gulf States Marine Fisheries Commission, No. 4, Gulf States Marine Fisheries Commission, Ocean Springs, MS. Collette, B. B., and J. L. Russo Morphology, systematics, and biology of the Spanish mackerels (Scomberomorus, Scombridae). Fish. Bull., U.S. 82(4): SEDAR SEDAR 28 South Atlantic Spanish mackerel Stock Assessment Report. SEDAR, North Charleston SC. 438 pp. 4

6 Table 1. North Carolina commercial landings of Spanish mackerel by water body ( ). Year Other Waterbodies Ocean > 3 miles Ocean 0-3 miles Pamlico Sound Grand Total ,293 22, , , , ,053 29, , , , ,692 16, , , , ,481 20, ,237 73, , ,705 33, ,743 81, , ,847 56, , , , ,669 49, ,980 96, , ,630 51, ,857 53, , ,517 13, , , , ,910 30, , , , ,781 3, , , , ,536 34, , , , ,383 39, , , ,439 Total 408, ,515 4,462,361 3,132,484 8,405,857 Average ( ) 31,423 30, , , ,604 Percent Average ( )

7 Table 2. North Carolina commercial landings of Spanish mackerel by gear type ( ). Year Gill Nets Beach Seine Pound Net Trawl Handlines Pots Haul Seine/ Swipe Net Other Gears TOTAL ,750 5,273 21,792 1,611 2,839 1,098 1, , ,447 3,356 33, , , , , ,118 1,746 1, , , , , , , , , , , , , , , ,727 6,155 2, , , ,824 1,458 3, , , , , , , ,702 3, ,201 1,237 4, , , ,308 1,676 96, , , , , , ,715-2, , , , , ,439 Grand Total 7,743,225 23, ,761 8,894 46,064 3,760 16, ,405,858 Average ( ) 595,633 1,817 43, , , ,604 Percent Average ( )

8 Table 3. North Carolina Spanish mackerel pound net landings by waterbody ( ). Waterbody Total Pounds ( ) Average ( ) Percent Average ( ) Albemarle Sound Core Sound 1, Croatan Sound Neuse River Pamlico River Pamlico Sound 559,467 43, Roanoke Sound 5 < 1 <1 Grand Total 562,718 43, Table 4. North Carolina Spanish mackerel pound net landings by month ( ). Year May June July August September October Total ,500 55,471 26,038 11, , ,118 35,463 10,571 5, , ,173 24,191 5,761 2,719 2, ,612 Grand Total 8, ,125 42,370 19,192 3, ,804 Monthly Average 2,930 38,375 14,123 6,397 1, ,935 Draft Addendum for Public Comment

9 Appendix A. Pound net analysis Biological data collected from Spanish mackerel in the North Carolina Division of Marine Fisheries (NCDMF) various fisheries-dependent and fisheries-independent programs were used to fit the allometric length-weight (in-lb) relation: W = al b where L is length in inches, W is weight in pounds, and a and b are parameters of the function. The predicted value of a was and the predicted value of b was Length samples of Spanish mackerel collected from the NCDMF Sciaenid Pound Net Sampling Program during 2010 through 2012 were used to characterize the length-frequency distribution of Spanish mackerel landed in North Carolina by pound nets. The numbers at length were converted to weight at length using the allometric length-weight function described above. This was done to estimate the proportion of weight at length. The average landings per year of Spanish mackerel by pound nets in North Carolina during August and September were computed using landings data from 2010 through 2012 (Table 1). This average was applied to the estimated proportion of weight at length to estimate landed weight at length. The estimated weight of Spanish mackerel landed by pound nets in North Carolina during August and September for fish greater than or equal to 11.5 inches and less than 12.0 inches is pounds. Table 1. Annual landings of Spanish mackerel by pound nets in North Carolina during August and September, Year Pounds , , ,341 Average 7,437 Draft Addendum for Public Comment